yes, it usually takes a couple/few days for the ROM to settle to get max battery life.
Unfortunately the ROM scene is pretty dim/grim these days - Kin3tx is supposed to be updated/maintained by someone else but haven't seen it yet. Liberty only builds off of official OTA updates, so you won't see a .901 version until that's officially released by VZW, if ever. Eclipse has been updated (at least in a test build) to be built off of 901.
As for me, I borked my phone pretty good the other day and couldn't fix it, due to lack of available Windows machine that worked (I'm on a Mac). Begged for and got a replacement from VZW that is on 893, rooted and forever rooted it, got my apps back via Titanium, and left it at that for now.